I think the question should be a matrix of x*x
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Replace NaNs with the number that appears to its left in the row.
Get the length of a given vector
Return the first and last character of a string
Do Fast Fourier Transformation
Matlab Basics II - Extract last 3 elements of a vector
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